Clark – US Secretary of Defence James Mattis said on Monday that curbing military threats from North Korea would be high on the agenda on his Asian tour this week, ahead of a visit by Donald Trump.

Tension has been high on the divided peninsula for months with Pyongyang staging its sixth nuclear test and launching two ICBMs that apparently brought much of the US mainland into range, while Trump and the North's leader Kim Jong-Un trade threats of war and personal insults.

Mattis, on his way to the Philippines for security talks with Southeast Asian defence ministers, said he would discuss the "regional security crisis caused by reckless...North Korea", among other issues.

At the forum, Mattis is also expected to hold three-way talks with his counterparts from South Korea and Japan – key US allies in Asia – before visiting Seoul for annual defence talks.

First presidential visit

"We will discuss... how we are going to maintain peace by keeping our militaries alert while our diplomats – Japanese, South Korean and US – work with all nations to denuclearise the Korean peninsula," Mattis told reporters on his aircraft.

He stressed the international community's goal was to denuclearise the flashpoint region, adding: "There is only one country with nuclear weapons on the Korean peninsula."

Mattis' visit to Seoul comes ahead of Trump's first presidential trip to Asia next month, which also includes South Korea. All eyes will be on Trump's message to the isolated North.

His recent remark that "only one thing will work" with North Korea fuelled concerns of a potential conflict.

But even some Trump advisers say US military options are limited when Pyongyang could launch an artillery barrage on the South Korean capital Seoul – only around 50km from the heavily-fortified border and home to 10 million people.

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